Nissan Armada cold air blowing with no heat issue on Nissan Armada

Some Nissan Armada owners report experiencing issues with cold air blowing instead of heat, which may be caused by several factors. One common issue is a malfunctioning heater control valve located in the engine bay, which can be diagnosed by checking the hoses on either side of the valve. Additionally, the multi-way control valve, or engine coolant bypass valve, may lead to only cool air being blown, with repairs potentially costing around $1,400. Some owners also find that a non-functioning blower motor, due to a blown fuse, bad relay, or other electrical issues, can result in no airflow from the vents when the heater is activated. Furthermore, a malfunctioning heater core can prevent hot coolant from circulating, leading to a lack of heat. Lastly, intermittent heating issues may arise from problems with the heat check valve, which may not always be resolved even after replacement. It is recommended for owners to investigate these components to identify and address the underlying issues effectively.